The Yantra is mainly placed in a cash box, almirah, puja place, locker, or in the treasure room. It is mostly found embossed on copper plates with a distinctive geometric pattern. It is defined by an interlocking pattern of squares, triangles, and floral patterns with infused energies. It is a combination of 4 most powerful wealth and prosperity Yantras:

Mahalakshmi Yantra sadhana is mainly done on a Wednesday with a pure heart and should. You first need to purify yourself and perform the puja during the evening hours. Mostly the sadhana is done on special occasions like Diwali when Goddess Mahalakshmi is worshipped in every home and office to invite the Goddess to their doorway.

Before starting the puja, first collect all the required materials as follows:

Sri Mahalakshmi Yantra
Yellow Aasana
Tamra Patra for water
Gangajala
Flower
Fruits
Coconut
Gol Supaari
Paan
Incense
Rudraksha Mala having 108 beads
Once you have collected all the materials, start the puja following the steps below:

Place the Yantra facing towards the East.
Wash the Yantra with gangajala.
Then wash it with plain water.
Wipe the Yantra carefully and place it on a clean piece of yellow asana.
On the aasana, place paan leaves and gol supari.
Gently place the Yantra on the same asana.
Light incense.
Offer vermillion.
Offer flowers, fruits and coconut.
Then chant the Mahalakshmi Yantra 108 times using the rudraksha mala.
The mantra used is: Aum Shree Mahalakyamya Namah